package Test;

import java.util.*;

public class SetTest {
	public static void main(String[] args) {
		Set<String> set = new HashSet<>();
		set.add(new String("a"));
		set.add(new String("b"));
		set.add(new String("c"));
		System.out.println(set);
		set.add(new String("a"));
		System.out.print(set);
	}
}
